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boat in still water.A steamer, going downstream in a river, covers the distance between two towns in 20 hours.Comingupstream, it covers this distance in 25 hours. The speed of water is 4 km/h. Find the distancethe two towns. |
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Answer» Let speed of boat is x km/h and distance between two town is y kmnet speed of boat in upstream=(x-4)km/hnet speed of boat in downstream=(x+4) km/hnow, according to question, y/(x+4)=20y=20 (x+4) ----------------(1) y/(x-4)=25y=25 (x-4) -------------------(2)for equation (1) and (2) 20 (x+4)=25 (x-4)20x+80=25x-100180=5xx=36 km/hput x=36 in equation (1)y=20 (36+4)=20 x 40=800 km |
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